592 SISTOTREMA. FOMES 



1967. S. sulphureuin (Quel.) Bourd. & Galz. Quel. Ass. fr. (1893), 

 t. in, fig. 10, as Daedalea sulphurea Quel. 



Sulphur eum, sulphur colour. 



P. 1-2 cm., whitish sulphur, or citron yellow, effused, little adnate; 

 margin concolorous, similar, or fibrillosely fringed. Spines sulphur, 

 then ochraceous orange, or tawny, apex white, pubescent, obtuse, scat- 

 tered, forming flexuose plates. Flesh concolorous, floccose, spider- 

 web-like, fibrillose, membranaceous, thin. Spores "light yellow, sub- 

 hyaline, at first smooth, then rough, spines hyaline, fugacious, oboval, 

 oblong, apiculate at the base" Bourd. & Galz. Bare earth, stones, 

 herbaceous roots and buried twigs. Jan. Dec. (The type has not 

 yet been recorded for Britain.) 



var. variecolor (Fr.) Bourd. & Galz. (= Hydnum variecolor Fr.) 



Variecolor, of different colours. 



Differs from the type in the white subiculum, the variable, scattered, 

 yellow, then tawny spines, and the oboval, echinulate spores, 7-8 x 4-6 /z,. 

 Dead oak stumps. Oct. Rare. 



Fr. 



(Fomes, tinder.) 



Pileus hard, woody, or corky, dimidiate, hoof -shaped, or resupinate, 

 sessile, often concentrically zoned, and covered with a rigid crust. 

 Tubes homogeneous, or heterogeneous, often stratose. Flesh white, 

 or coloured. Spores white, or coloured, globose, subglobose, elliptical, 

 or elliptic-oblong, smooth. Cystidia present, or absent, coloured or 

 hyaline. Perennial. Growing on wood. 



*Flesh deeply coloured. 



1968. F. fomentarius (Linn.) Fr. Fr. Sverig. atl. Svamp. t. 62. 



Fomentum, touch- wood. 



P. 10-60 cm., greyish, becoming hoary, hoof-shaped, or dimidiate, 

 attached by a broad base, 7-20 cm. thick, remotely and concentrically 

 sulcate, opaque, pruinose, cuticle thick and very hard. Tubes ferrugi- 

 nous, 13 cm. long, stratose ; orifice of pores glaucous pruinose, then 

 ferruginous, minute, round. Flesh dark brown, soft, floccose, very thick. 

 Spores hyaline, elliptic oblong, 16-18 x 5jii, 1-3-guttulate. Beeches, 

 oaks, limes, hornbeams, and birches. Jan. Dec. Common, (v.v.) 



var. nigrescens (Klotzsch) Lloyd. Lloyd, Polyp. Issue, fig. 210. 



Nigrescens, becoming black. 



Differs from the type in its black, shining, strongly concentrically 

 sulcate crust. Beeches. Jan. Dec. Not uncommon, (v.v.) 



